Seven Sins Choppers New "DEATH RAY DISH" Air Cleaner is an original design that we machine from super thick solid stock aluminum. This model has a machined finish and houses a red colored exposed K&N filter element for superior air flow and filtration. It comes with a stainless center mounting bolt. This is our 4" version. Made in USA.INSTALLATION NOTES:If you do not already have the low profile mounting bolts then you will need to add them in the options. These are needed for flush mounting as the filter will interfere with standard stock allen head style screws. The stainless screws are 1/4"-20 thread.